Fig. 1. Bell-Bloom configuration with linearly polarized pump beam.线极化的Bell-Bloom测磁系统基本原理图

Fig. 2. Interaction between pump light and cesium atoms: (a) Light-atom interaction; (b) interaction between linearly polarized pump light and cesium atoms.抽运光与铯原子相互作用　(a)光与铯原子相互作用; (b)线偏振的抽运光与铯原子相互作用

Fig. 3. Evolution of the populations in each Zeeman sublevels with time of cesium atoms’s ground state and : (a) Results of direct pump with the pump intensity ; (b) results of indirect pump with the pump intensity 铯原子基态 和 各个磁子能级的布居数随时间的演化　(a) 时, 直接抽运的情况; (b) 时, 间接抽运的情况

Fig. 4. Signal amplitude and relative sensitivity change along with the pump intensity under the condition of magnetic resonance: (a) Direct pump with ; (b) indirect pump with 磁共振时, 信号幅度 与约化磁场灵敏度 随抽运光光强 的变化　(a)直接抽运, ; (b)间接抽运,

Fig. 5. Experimental setup. SAS, saturated absorption spectrum; VNDF, variable neutral density filter; HWP, half wave plate; PBS, polarization beam splitter; HR, high reflectivity mirror; GTP, Glan-Tylor prism; WP, Wollaston prism; EO-AM, electro-optical amplitude modulator; BPD, balanced photodetector; LIA, lock-in amplifier; AC, alternating current power supply; DC, direct current power supply; HC, Helmholtz coils; OSC, oscilloscope; SA, spectrum analyzer; P, direction of light polarization实验装置图(SAS, 饱和吸收谱; VNDF, 连续可变衰减片; HWP, 半波片; PBS, 偏振分束器; HR, 高反镜; GTP, 格兰泰勒棱镜; WP, 渥拉斯顿棱镜; EO-AM, 电光振幅调制器; BPD, 平衡探测器; LIA, 锁相放大器; AC, 交流电源; DC, 直流电源; HC, 亥姆霍兹线圈; OSC, 示波器; SA, 频谱分析仪; P, 光的偏振方向)

Fig. 6. Spectra of magnetic resonance with direct pump and indirect pump.直接抽运与间接抽运的磁共振谱线

Fig. 7. Variation of magnetic resonance linewidth with pump intensity : (a) Direct pump, ; (b) indirect pump, /W 磁共振线宽 随抽运光光强 的变化　(a)直接抽运, ; (b)间接抽运,

Fig. 8. Variation of SNR and sensitivity with the pump intensity under the condition of magnetic resonance: (a) Direct pump; (b) indirect pump 磁共振时, 信噪比SNR与磁场灵敏度 随抽运光光强 的变化　(a)直接抽运; (b)间接抽运

Fig. 9. sensitivity and pump intensity with indirect pump under the condition of different relaxation rate . 在自旋弛豫率 不同时, 间接抽运的约化磁场灵敏度 随抽运光光强 的变化